<DIV>LEDs have far too much forward voltage drop, and I don't know of any that can handle that kind of current (although you could parallel a resistor). You would be wasting more than one cell's energy.</DIV>
<DIV> </DIV>
<DIV>I like the idea of having two switches. You could try each switch separately and check the servo response, sorta like checking both mags before takeoff in a full-scale.</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><BR><B><I>Tom Simes <nsrca@shinymetalass.com></I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">I understand and like elements of both Lance's and Keith's approach, but<BR>one thing that I see missing is some easy to spot indication that the<BR>primary pack has sustained a failure. I know you could stick a meter on<BR>the backup pack between each flight to see if it has discharged any, but<BR>I was thinking of something that would stand out.<BR><BR>I'm not an EE, but do you think it would be possible to find a LED with<BR>a low enough forward drop to be used for both preventing discharging as<BR>well as an indicator that there is a condition requiring immediate<BR>attention? I'm thinking that if the LED is inline with the lower<BR>capacity pack, it should only illuminate if current is flowing from that<BR>pack in either Lance's or Keith's design - am I wrong?<BR><BR>-- <BR>Tom<BR><BR></BLOCKQUOTE>